private void BtnDelegate_Click(object sender, EventArgs e)
{
rtbOutput.Text = string.Empty;
//Parameters to be used within the delegate instantiations.
int firstNumber, secondnumber;
//Here we instantiate doCalc and point to the methods AddNums, and subtract respectively with delegate b and c
//Recal that doCalc requires parameters int, int. ( delegate doCalc(int number1, int number2) )
doCalc b = addNums;
doCalc c = Subtract;
if (int.TryParse(txtNumOneInput.Text, out firstNumber) == true && int.TryParse(txtNum2Input.Text, out secondnumber) == true)
{
//Here when we need to call the delegates and run them for a result its essentially this
//you call your instantiaton of your delegate in this case b, and then insert parameters that would've been
//inserted into the provided methods otherwise.
//delegateVariable[method parameters of method provided]
//equivalant to addNums(firstNumber, secondNumber)
rtbOutput.Text = $"Adding Numbers: {b(firstNumber, secondnumber)}\r\n";
//Same thing here for delegate b, but doing this for c with the subtract method rather than the addNums
//Method
rtbOutput.Text = $"Subtracting Numbers: {c(firstNumber, secondnumber)}";
}
else
{
MessageBox.Show("Invalid input", "Number inputs");
rtbOutput.Text = "Error";
}
}
static void Main(string[] args)
{
Console.WriteLine("임의의 두 수를 입력하십시오. ex.(1,2)");
int[] result = Array.ConvertAll((Console.ReadLine()).Split(','), i => int.Parse(i));
doCalc Calc = (doCalc)Delegate.Combine(
new doCalc(Add),
new doCalc(Substract),
new doCalc(Multiple),
new doCalc(Divide)
);
Calc(result[0], result[1]);
}
